noise when excellerating
 

i have had my ml 270 for a week dont know if it is ok or not but when i exellerate the engine sounds noisy had a c250 before that was quiet anybody help me please

Give us a little better description please, is there same noise if you rev the engine in neutral? What RPM are you excellerating upto? May not be the engine, exhaust or driveshaft could make noise at excelleration too.